Machine for spreading, truing, and gaging drills.



No. 656,4l5. Patented Aug. 2|, I900.

- 0. a. momma.

MACHINE FOR SPBEADING, TRU ING, AND GAGING DRILLS (Application filedApr. 16, 1900.)

(No Model.)

UNTTED STATES 3 PATENT OFFICE.

DAVID G. MORGAN, OF QUARTZ MOUNTAIN, CALIFORNIA, ASSIGNOR OF ONE-HALF TORICHARD H. MCNAMARA, OF SAME PLACE.

MACHINE FOR SPREADING, TRUING, AND GAGING DRILLS.

SPECIFICATION forming part of Letters Patent No. 656,415, dated August.21 1900.

Applioation flled April 16, 1900. Serial No. 13,031. (No model.)

T0 at whom it may con-00771,.-

Be it known that 1, DAVID G. MORGAN, a citizen'of the United States,residing at Quartz Mountain, county of Tuolumne, State of California,have invented an Improvement in Machines for, Spreading, Truing, andGaging.

Drills; and I hereby declare the following to be a full, clear, andexact description of the same. i

My invention relates tti a machine which is designed for spreading,truing, and gaging rock-drills of that class in which the cuttingbitsare formed at right angles with each other.

It consists of tools or formers into which the cutting-bits of thedrills are placed, clamps for holding them in position, and hammersacting upon the formers to give the proper shape and size to the bit.

My invention also comprises details of construction which will be morefully explained by reference to the accompanying drawings, in whichFigure 1 is a perspective View of the machine. Fig. 2. is a plan. Fig. 3is alsection of the slidable movable guide. Fig. 4. is a side View ofthe dies.

Drills which are used for perforating rock are made with thecutting-bits in the form of a cross, and these drills may be used withvarious forms of operating mechanism. When the drills wear, the outerangles become worn off. The drill will then cut a hole of a lessdiameter and it is necessary toagain extend the cutting-bits to theproper length and to sharpen and straighten the edges.

It is the object of my invention to thus re pair and sharpen the drills.

The first operation to which the drill is subjected is what is known asthe fuller, which is designed to spread the metal outward and extend thecorners or angles which have been worn off. For this purpose the dies orformers A are pivoted in a suitable framework or horizontal bed-plate 2.The points of the formers are made with V-shaped grooves or notches inthem, and the drill is presented so that one of the. lines of bits 3will lie within these V-shaped grooves, while the transverse line willstand vertically with relation thereto. A channel-4 is made in the it ofthe formers.

bed-plate to admit the lower end of the vertically-disposed bits'andallow the horizontal ones to fit Within the grooves or channels Thepoints of these formers are normally pressed together by means of aspring 5, located between the opposite ends of the formers and acting toseparate them and force the grooved ends toward each other. Upon eachside of the drill-shank are jaws 6,

which are movable to and from each other by wedge or cam shaped blocks7. Various devices may be used for this portion of the apparatus. Ashere shown they consist of wedges slidable in grooves or channels andmoved backward or forward by a forked lever S, which is fulcrumed to thebed-plate, and the arms project up through slots in the bedplate andengage with corresponding slots in the wedges or cams 7, so that bymoving the lever back and forward these wedges or cams will becorrespondingly moved. The jaws 6 are pivoted i n carriers 9, which areslidable in guides, and the rear ends are beveled, so as to be actedupon by the wedges 7. Springs 10 serve to retract these carriers whenthe wedges are withdrawn, and thus separate the jaws 6. By pivoting thejaws to the carriers the jaws are allowed to turn about their pivots, sothat their clamping faces will fit against the drill-shank and adjustthemselves to whatever taper or divergence there may be to the drillnear its end, the drill being spread at the cutting end, so as to haveconsiderably greater diameter thanthe drill-shank.

The drill having been placed between the jaws 6 and one line of'the'bits 3 lying in the channels of the fullers A, the drill-shank canbe firmly clamped between the jaws 6. 11 is a guided slidable headhaving convergent inner faces which are adapted to fit over the outerends of the fulcrumed fuller-jaws A.

This slide is connected with a piston movable in a cylinder 12 andactuated by compressed air or other suitable fluid under pressure, themovement being controlled by valves of any description. (Not hereshown.) When the drill is in position, the head His caused toreciprocate, and its convergent inner faces striking upon the outer endsof the jaws A will cause the grooved ends to slide outwardly with eachstroke, and as the drill is firmly clamped the action of these groovedjaws is to force the metal from the center outward and spread the bitswhich are being acted between the two parts 18 and 19.

upon to the required length. It will be understood that the drill isheated before being placed in the jaws and that the rapid action of. thesliding hammer upon the fuller-jaws will spread the bits of the drill tothe required extent. The drill-shank is then released and is turned soas to bring the other bits into 'line with the fuller-jaws and these areacted upon. This operation makes the cutting-jaws of the bits irregular,and in order to straighten them as soon as the fullingor spreading hasbeen completed the drillshank is immediately released and placed betweenjaws 13, mounted in the same frame by the side of the first-named partof the apparatus. By means of a lever 14 the drillshank is clamped withthe bits extending into a die 15, which is in the form of V-shapedgrooves or notches crossing each other in the same manner that the bitsof the drill cross, these bits being fitted into the grooves of the die15. A hammer 16, the shank of which is actuated by a piston in thecylinder 17, is caused to strike upon the die,and this straightens theedges of the cutting-bits of the drill. The latter is then immediatelyreleased and is transferred to the third part of the apparatus, whichconsists of a fixed die 18 and a guided movable die 19, situated in lineabove it. These two dies have vertical slots or channels formed in them,as shown at 20, and these receive the vertical cutting-bits of thedrill, while the horizontal oneslie in the space The part 19 is normallyraised by springs 21, and in line above it is a hammer 22, which isactuated by a plunger in the cylinder 23, with suitable valveconnections, as previously described, so that atter the bits of thedrill have been inserted into these dies the strokes of the hammer willgive the final sizing and gaging of the bits of the drill, so that itwill be in proper form to be again used in the drill-hole. The drill isthen tempered and is ready for use. By means of these successive devicesmounted contiguous to each other a single heat is sufficient to spreador full the corners, to dolly or square the ends, and to size and gagethe drill.

Having thus described my invention, What I claim as new, and desire tosecure by Letters Patent, is-

1. A machine of the character described consisting of separablechanneled jaws, to cans for holding the drill in contact with said jawsand operating them to spread the bits, a die by which the ends of thebits are squared or straightened after being spread, and a gage andsizer into which the bits are successively inserted, and hammersactuated by fluidpressure to complete the operation at a single heat. 7

2. In a machine of the character described, a channeled base, leversfulcrumed to open and close horizontally having grooves formed in theends adjacent to the channel, clamps by which the drill is held with thehorizontal bits engaging the grooves, and a slidable hammer havingconverging openings to engage the outer ends of the levers whereby thegrooved ends act to spread the bits of the drill which lie therein.

3. In a machine of the character described, hinged adjustable clamps andmechanism by which they are closed to grip the drillshank between them,spring-pressed leverarms having grooves in the ends within which groovesthe horizontal bits of the drill are fitted, a hammer having aconverging channel adapted to engage and close the outer ends of thelevers and to correspondingly spread the grooved ends and extend thebits.

4. The combination in a machine of the character described, of groovedspreadinglevers, jaws for adjustably holding the drill with its bits incontact therewith, carriers for the jaws, means for moving the carriers,and a hammer and actuating mechanism for the spreading-levers.

5. A machine of the character described comprising groovedspreading-levers, jaws for holding the drill with its bits in contactwith the lovers, carriers for the jaws and means for moving thecarriers, a hammer and means for operating the spreading-levers, meansfor truing the bits of the drill, and means for sizing andgaging thebits.

6. The combination of grooved spreadinglevers, movable jaw-carriers,jaws pivotally secured to the carriers whereby they adjust themselves tothe drill-shank, means for adjusting and locking the carriers, a hammerfor actuating thespreading-levers, and means for actuating the hammer.

7. A machine of the character described including mechanism for holdingand spreading the drill-bits; mechanism for holding and truing saidbits; mechanism for sizing and gaging the bits; and power devices foroperating each of said mechanisms whereby the operation is completed ata single heat.

In witness whereof I have hereunto set my hand.

DAVID G. MORGAN. Witnesses:

S. H. NOURSE, J ESSIE O. BRODIE.

